Evidence for Triangular D3h Symmetry in 12C

被引：194

作者：

Marin-Lambarri, D. J. ^{[1
]}

Bijker, R. ^{[2
]}

Freer, M. ^{[1
]}

Gai, M. ^{[3
,4
]}

Kokalova, Tz ^{[1
]}

Parker, D. J. ^{[1
]}

Wheldon, C. ^{[1
]}

机构：

[1] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[2] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico

[3] Univ Connecticut, LNS Avery Point, Groton, CT 06340 USA

[4] Yale Univ, Dept Phys, Wright Lab, New Haven, CT 06520 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 01期

关键词：

STATES; MODEL;

D O I：

10.1103/PhysRevLett.113.012502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a measurement of a new high spin J(pi) = 5(-) state at 22.4(2) MeV in C-12 which fits very well to the predicted (ground state) rotational band of an oblate equilateral triangular spinning top with a D-3h symmetry characterized by the sequence 0(+), 2(+), 3(-), 4(+/-), 5(-) with almost degenerate 4(+) and 4(-) (parity doublet) states. Such a D-3h symmetry was observed in triatomic molecules, and it is observed here for the first time in nuclear physics. We discuss a classification of other rotation-vibration bands in C-12 such as the (0(+)) Hoyle band and the (1(-)) bending mode band and suggest measurements in search of the predicted ("missing") states that may shed new light on clustering in C-12 and light nuclei. In particular, the observation (or nonobservation) of the predicted ("missing") states in the Hoyle band will allow us to conclude the geometrical arrangement of the three alpha particles composing the Hoyle state at 7.654 MeV in C-12.

引用

页数：5

共 21 条

[1] Evidence for Tetrahedral Symmetry in 16O [J].

Bijker, R. ;

Iachello, F. .

PHYSICAL REVIEW LETTERS, 2014, 112 (15)

[2] The algebraic cluster model: Three-body clusters [J].

Bijker, R ;

Iachello, F .

ANNALS OF PHYSICS, 2002, 298 (02) :334-360

[3] SPECTRUM-GENERATING ALGEBRA FOR X(3) MOLECULES [J].

BIJKER, R ;

DIEPERINK, AEL ;

LEVIATAN, A .

PHYSICAL REVIEW A, 1995, 52 (04) :2786-2790

[4] Cluster states in nuclei as representations of a U(ν+1) group -: art. no. 067305 [J].

Bijker, R ;

Iachello, F .

PHYSICAL REVIEW C, 2000, 61 (06) :673051-673054

[5] Structure of the Hoyle state in 12C [J].

Chernykh, M. ;

Feldmeier, H. ;

Neff, T. ;

von Neumann-Cosel, P. ;

Richter, A. .

PHYSICAL REVIEW LETTERS, 2007, 98 (03)

[6] Hoyle state and rotational features in Carbon-12 within a no-core shell-model framework [J].

Dreyfuss, Alison C. ;

Launey, Kristina D. ;

Dytrych, Tomas ;

Draayer, Jerry P. ;

Bahri, Chairul .

PHYSICS LETTERS B, 2013, 727 (4-5) :511-515

[7] Ab Initio Calculation of the Hoyle State [J].

Epelbaum, Evgeny ;

Krebs, Hermann ;

Lee, Dean ;

Meissner, Ulf-G. .

PHYSICAL REVIEW LETTERS, 2011, 106 (19)

[8] Evidence for a new 12C state at 13.3 MeV [J].

Freer, M. ;

Almaraz-Calderon, S. ;

Aprahamian, A. ;

Ashwood, N. I. ;

Barr, M. ;

Bucher, B. ;

Copp, P. ;

Couder, M. ;

Curtis, N. ;

Fang, X. ;

Jung, F. ;

Lesher, S. ;

Lu, W. ;

Malcolm, J. D. ;

Roberts, A. ;

Tan, W. P. ;

Wheldon, C. ;

Ziman, V. A. .

PHYSICAL REVIEW C, 2011, 83 (03)

[9] Reexamination of the excited states of 12C [J].

Freer, M. ;

Boztosun, I. ;

Bremner, C. A. ;

Chappell, S. P. G. ;

Cowin, R. L. ;

Dillon, G. K. ;

Fulton, B. R. ;

Greenhalgh, B. J. ;

Munoz-Britton, T. ;

Nicoli, M. P. ;

Rae, W. D. M. ;

Singer, S. M. ;

Sparks, N. ;

Watson, D. L. ;

Weisser, D. C. .

PHYSICAL REVIEW C, 2007, 76 (03)

[10] The analysis of angular correlations in breakup reactions: The effect of coordinate geometries [J].

Freer, M .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1996, 383 (2-3) :463-472

← 1 2 3 →